Genus Ischnamoeba Geisen, Bass & Berney, 2015
Diagnosis: Uninucleate, branching naked amoebae. Cells usually thin, extended and flat, showing no well-defined cell body, except often a slight broadening in the area containing the nucleus. Never reticulate, with whole cells often bent, but not very branched; branching more pronounced in condensed cells or in condensed parts of individual cells. Very thin pseudopodia produced almost exclusively at distal parts of cells and more pronounced in condensed organisms, often branching. Movement of entire cells too slow to be directly observable. Cysts round or sometimes oval.
Type species: Ischnamoeba montana
Ischnamoeba montana Geisen, Bass & Berney, 2015
Diagnosis: Non-marine, with morphological characteristics of the genus. Studied organisms between 35-140 µm in size. Branches of narrow width of often only 2 µm (up to 12 µm in rarely found, non-elongated amoebae. Exclusively bacterivorous. Cysts round, sometimes oval, 6-16 µm in diameter.